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20100901
20100930
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that noise cause damage to your hearing? terry mcsweeney joins us now from the bart station in oakland. terry? >> yeah. the report this morning san francisco chronicle says for bart passengers it's loud. the passengers we spoke with said they already knew that but didn't know exactly how loud. and when we told them, the response was deafening. that is what it sounded like this morning as we rode bart in the trans bay tube. the reading of 100 decibels, the same as a jack hammer. you can't have a conversation. maybe the reason nobody tried to have one. the high-pitched irritation lasted perhaps a minute, not long enough to cause hearing loss. >> while you go on for hours and hours, this is pretty much 20 or 30-second stretch. >> johnson says the high-pitched screech is caused by the trains rolling over tiny ripples in the tracks which is caused by steel on steel and most prevalent where the elevation changes. bart riders talk about the jack hammer comparison. >> and that's a good analogy, definitely. jack hammer. >> definitely. >> jack hammer? well, i mean, it's hard to hold a conversation. so
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